WELCOME Good Morning, I am Nagarajan from INDIA doing material handling equipment manufacturing, supplying and exporting, I always used to dream something innovative way to develop concepts and ideas in my field of engineering So for I have designed various components for the cranes, For example gearboxes, Electrical wire rope Hoists, electrical safety circuits and accessories. Among these, my Drum rope guide design, Cross pulling prevention Mechanisms, hypocycloid limit switches are very famously accepted in my colleagues organizations This time I have developed Double drum auxiliary EOT crane crab with mono hook, which is very innovative idea for compact design. Normally Auxiliary crabs are designed and work independently. Each hoist will be provided with separate hooks and electrical control panels When Multiple hoists are combined, we can save manufacturing cost as well as operational cost also. At the same time new features could be possible Technically it was so challenge me for synchronizing robe cable balance, to overcome this setbacks I designed special self adjusting equalizer pulley assembly. Please go through rest of the presentations and give your valuable opinions, please share if you like this Thanks Nagarajan.B +91 9791222047 ( CEO) rajanihoistandcranes@gmail.com Friday, April 19, 2019

1. RAJANI HOIST & CRANES PRESENTS
Auxiliary Crane
With Mono hook block
Book
5

2. This is a promotional package, Strictly Not for Commercial purpose
D O U B L E D R U M A U X I L I A R Y E O T C R A N E C R A B C O N C E P T S , D E S G I N A N D P R O T O T Y P E
Mono hook design proposal
DOUBLE GEAR
Transmission Elements
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 Double Gear transmission elements
RAJANI HOIST & CRANES
#175,B, &th Cross, Hegganahalli Post,Peenya 2nd Stage
Bangalore,Karnataka INDIA
Over 20 years, DOUBLE GEAR has earned a nationally recognized reputation for
expertise in power transmission engineering and automation, cranes, hoist and crane duty
modular gearbox design would helps engineers and manufacturers to construct robust
infrastructures without any complications and completely tested & trusted.

3. i
WELCOME
Good Morning, I am Nagarajan from INDIA doing material handling
equipment manufacturing, supplying and exporting, I always used to dream
something innovative way to develop concepts and ideas in my field of
engineering
So for I have designed various components for the cranes, For example
gearboxes, Electrical wire rope Hoists, electrical safety circuits and accessories.
Among these, my Drum rope guide design, Cross pulling prevention
Mechanisms, hypocycloid limit switches are very famously accepted in my
colleagues organizations
This time I have developed Double drum auxiliary EOT crane crab with mono
hook, which is very innovative idea for compact design. Normally Auxiliary
crabs are designed and work independently. Each hoist will be provided with
separate hooks and electrical control panels
When Multiple hoists are combined, we can save manufacturing cost as well as
operational cost also. At the same time new features could be possible
Technically it was so challenge me for synchronizing robe cable balance, to
overcome this setbacks I designed special self adjusting equalizer pulley
assembly. Please go through rest of the presentations and give
your valuable opinions, please share if you like this
Thanks
Nagarajan.B +91 9791222047 ( CEO)
rajanihoistandcranes@gmail.com
Friday, April 19, 2019

4. ii
SECTION 1 Basic idea
Picture showing how the How two hoist are linked together
Here, the main hoist which has connected with 20HP motor with Gearbox has
been mounted on top of the crab. While the secondary hoist (5 ton) is places
under the crab suspension basket. So it will save space for the crab and more
cross travel span is possible.

5. iii
SECTION 2 how it works
Strip out picture shows how the both drums are places with separate motors with
gearboxes
Since both drums are double grooved, two different length ropes are
connected with self length adjustable tilting pulley. Left groove of DrumA
rope is looped to Right Groove of DrumB through Common tilting
pulley. A separate section will explain more brief about this pulley

6. iv
SECTION 3 Ropes and Bottom Block Configuration
A close look of the Rope and equalizer pulley
The bottom block has 4 sleeves to connect 4X8 ways rope configuration
two ropes from DrumA passes through bottom block outer sleeves to
equalizer pulleys and coming back to bottom block inner sleeves and
connecting to DrumB
The lifting Speed Will be 8/1of the drum RPM while both drums are
rotating on same speed, will vary subject to single motor running,
reciprocal rotation and VFD controlled operation

7. v
SECTION 4 how the self tilting equalizer works
Picture shows how the equalizer block designed
The Equalizer pulley block has been designed with two sleeves fitted in
zigzag position. Since the ropes from the drums are may vary in length ( in
due course), it will tilt accordingly to balance the rope. so the bottom
block center of gravity will be balanced. It is allowable up to 25mm length
variation among rope lengths
The equalizer pulley block has fitted with limit switch to control
maximum uplift allowable to user

8. vi
SECTION 5 Self aligned CT Wheels block
Suspension CT wheel magazine assembly
In case of low headroom hoisting necessary, Double wheel CT
with interlink connection is advisable. Through Chain sprocket or
Direct gear drive. The total assembly may be attached to main
fabrication body by suspension spring method. Next photo shows
how it is fastened

9. vii
The picture shown how the magazine is assembled in to the main framework
The Square block of the suspension Ct wheel assembly is inserted
in to the main fabrication cavity bay. The screw rod from the
magazine assembly, fastened on top of the crab frame. The
spring tension is maintained from the main body to Ct magazine
as required. Usually 2-3 mm is sufficient.
When the crab is seated on the rail, all 4 sets of wheels get contact
with rail wheel evenly. If any rail alignment is out of range, the
wheels will automatically adjust to get contact with rail

10. viii
SECTION 6 power transmission (Motor and Gearbox)
Picture shows how the motor, Breaks, Gearbox and Drums are connected
The main crab is connected with 20HP 6phole asynchronous AC motor
And described as Crane duty, CD40% by the OEM manual
Hydraulic disc break is fitted in between the motor shaft and Gearbox
Pinion input. It is selected as per the torque of the described motor
Heavy duty 500CC crane duty Gearbox, made with Alloy carbon materials
gears and pinion, profile grounded for noiseless operation. The final stage
gear is directed coupled with DrumA

11. ix
SECTION 6 Unit Coolant and Heat transformers
Picture shows unit cooling arrangements
The gear box has forced oil coolant facility fitted, apart from this facility, a
manual cooling fan also fitted, which has been configured with PTC thermistors
, if Gearbox,Motor and Breaks exceed 60 Degree Celsius, the manual cooling
fan will start automatically and run until the temperature reduced.
The drum bearing unit has load shell in built, if exceed the load it will trigger
OVERLOAD RELAY in the main control panel to stop any uplift operation
Atmosphere temperature also would start the manual cooling mechanisms

12. x
SECTION 7 Drums and Rope Guides
Picture shows Drum with Rope Guide
We have developed our proprietary type rope guide, which has proven very
successful in industry. Unlike conventional method, this has been designed as
rolling type. Since no rubbing parts are presents, the life expectance is more.
And moreover Installation of the rope guide also very easy. It can be fitted on
any drums and rope diameter. The rollers are guided in the grooves of the drum
while rotating. The rope will be released or retracted accordingly.
The rollers are made from En24 material and soft nature. A spring has been
provided for tensioning the guide as well as keeps the rolled rope from loosing

13. xi
SECTION 8 Electrical Accessories
Electrical Control panel has 3 phase 415V AC accessories. Unless
otherwise specified. Signal Voltage normally 110VAC /24VDC as per the
customer requirement. Box made up of metel sheet and Powder coated
for rust proof. Fir special application we can provide flameproof panel
also. MCB, Single Phase preventer, VFD, Contactors, Overload relays,
Ammeters, Voltmeters, Transformers all are from reputed manufacturers
and quality components we using
Pendent Switch 4+1,6+1,8+1 and Dual, Joystick style, Radio remote
are available as per the customer specifications.

14. xii
SECTION 9 End Carriage (Long travel)
The end Carriage is simple design with two Collar bearings attached, doing this
model will much helpful for servicing in future. Inside the wheel journal
bearings are given for local radial load
End Carriage Driving Units may be worm, Planetary, or Bevel helical gearboxes.
We have an R&D works for Alpha start / regenerative braking gearboxes for
End carriages. I will update soon

15. xiii
SECTION 10 (Variable Speeds without VFD
The main goal of the double drum mono hook block design is providing
customers with variable micro and positioning speed in the hoist. To
accomplish this idea this crab has two motor,drums and gearboxes but common
mono hook block
Motor of DrumA and DrumB may drive on differential speeds and velocity to
enable the load to move maximum 8 different types of motions and speed
+ Forward RPM - Reverse RPM ∞Motor Stalled
Motor A 960+ Motor B 1440+
Motor A 960 + Motor B 1440 –
Motor A 960- Motor B 1440+
Motor A 960- Motor B 1440-
Motor A 960 ∞ Motor B 1440+
Motor A 960+ Motor B 1440 ∞
Motor A 960 ∞ Motor B 1440-
Motor A 960- Motor B 1440 ∞
Thanks for Reading
Nagarajan
CEO, Rajani Hoist and cranes
BANGALORE , INDIA
Saturday, April 20, 2019